A dust reduction device for tunnel opening excavation

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically is a dust reduction device for tunnel opening excavation, comprising a support seat; an arc-shaped support plate matching the shape of the tunnel opening is arranged on the support seat, an arc-shaped dust suction chamber is connected to the outer end of the support plate, a group of annular dust suction grooves evenly distributed are arranged on the bottom surface of the dust suction chamber, a water tank is arranged on one side of the support seat, the water tank is connected to the dust suction chamber through an air duct, and a suction fan is arranged on the air duct; the present invention can reduce the dispersion of dust during tunnel opening excavation, and at the same time, the dust is sucked and collected at multiple points through the dust suction grooves on the dust suction chamber, so that the dust can be collected more comprehensively and fully, thereby reducing the cost of dust collection.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, in particular to a tunnel opening excavation dust reduction device. Background Art

[0002] Tunnel excavation is often carried out by drilling and blasting, which will produce a lot of dust. High concentrations of dust not only affect the health of workers, but also have an adverse impact on subsequent construction work, and will pollute the surrounding environment, especially when the tunnel is near a residential area, it will have a greater impact on the lives of surrounding residents.

[0003] A Chinese patent with publication number CN201922207634.5 discloses a ventilation and dust reduction device for tunnel openings, including a tunnel and a road surface. A blower is installed at the inlet on the inner right end of the tunnel, and the blower is fixed on the road surface. A dust reduction device is installed at the inner left end of the tunnel. The dust reduction device includes a drainage pipe, a water reservoir, a first drainage pipe, an air intake pipe, a suction fan, a second drainage pipe, and a slow wind filter plate. The above device is used at the tunnel opening, and can ventilate and dust the inside of the tunnel, ensure the air flow in the tunnel, and at the same time, it can suppress the flying dust in the tunnel to a certain extent, ensuring the driving safety in the tunnel.

[0004] Although the above technology can collect the dust at the tunnel entrance by suction fans, the suction range of the suction fans is limited. In order to achieve a large-area dust suction effect, multiple sets of suction fans need to be installed, or the dust suction power of the suction fans needs to be increased, thereby increasing the dust reduction cost and easily resulting in dust suction dead corners, which affects the dust reduction effect during tunnel entrance excavation.

[0005] Therefore, the present invention provides a tunnel opening excavation dust reduction device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a tunnel opening excavation dust reduction device described in the present invention comprises a support seat; an arc-shaped support plate matching the shape of the tunnel opening is arranged on the support seat, an arc-shaped dust suction chamber is connected to the outer end of the support plate, a group of annular evenly distributed dust suction grooves are opened on the bottom surface of the dust suction chamber, a water tank is arranged on one side of the support seat, the water tank and the dust suction chamber are connected by an air duct, and a suction fan is arranged on the air duct; although the dust at the opening can be sucked in and collected by a suction fan in the prior art, due to the limited suction range of the suction fan, in order to achieve a large-area dust suction effect, multiple groups of suction fans need to be arranged, or the dust suction power of the suction fan needs to be increased, thereby increasing the dust reduction. Cost is high, and there are prone to dust suction dead corners, which affects the dust reduction effect when the tunnel entrance is excavated; the present invention places the support plate and the dust suction chamber at the entrance, and can seal the gap between the top surface of the dust suction chamber and the entrance through a sealing material, so as to achieve seamless fitting of the dust suction chamber and the entrance; subsequently, when the suction fan is exhausting air, the dust in various areas of the entrance can be sucked in through the annular dust suction grooves evenly distributed on the bottom surface of the dust suction chamber, and introduced into the water tank through the air duct, so that the dust in the air flow is dissolved in water, reducing the pollution to the environment caused by the dust scattered everywhere when the tunnel entrance is excavated; at the same time, the dust is sucked and collected at multiple points through the dust suction grooves on the dust suction chamber, so that the dust can be collected more comprehensively and fully, thereby reducing the cost of dust collection.

[0008] Preferably, a group of dust-proof curtains are connected to the bottom surface of the dust suction chamber, the side ends of two adjacent dust-proof curtains fit together, and the dust-proof curtains can block the opening of the dust suction chamber; by arranging multiple groups of dust-proof curtains on the dust suction chamber, the dust suction chamber can be effectively blocked while ensuring the normal entry and exit of workers, thereby further reducing the overflow of dust inside the hole.

[0009] Preferably, a cavity is provided inside the dust-proof curtain, the top end of the dust-proof curtain is connected to the air inlet end of the dust suction groove, and a plurality of dust suction holes are provided on the side wall of the dust-proof curtain near the inner end of the tunnel opening; when the dust suction groove is suctioning air, external gas and dust can be sucked in and collected through the dust suction holes on the dust-proof curtain, and since the dust suction holes can be arranged on the dust-proof curtain over a larger area, the dust at the opening can be more fully and comprehensively sucked in and recovered, further reducing the situation of blind spots in dust removal at the opening.

[0010] Preferably, a paddle is rotatably connected to the inner wall of the dust curtain corresponding to the inner top of the dust suction hole; when dust suction is performed, the external airflow can push the paddle away from the dust suction hole and rotate it, thereby making the dust suction hole in an open state; when the dust collection work is completed, the paddle closes under its own gravity, thereby blocking the dust suction hole and reducing the overflow of dust sucked in by the dust curtain.

[0011] Preferably, a filter is connected to the end of the dust suction groove; when the gas sucked in the dust curtain flows through the dust suction groove, some larger impurities can be intercepted by the filter, thereby reducing the larger impurities flowing into the suction fan, causing the suction fan to get stuck or malfunction.

[0012] Preferably, the filter is arranged in an arc shape, and a rotating rod is rotatably connected to the inner wall of the dust curtain corresponding to the bottom end of the filter, the axis of the rotating rod coincides with the axis of the filter, and a group of annularly evenly distributed rotating plates are connected to the side walls of the rotating rod. When the end of the rotating plate rotates, impurities at the filter can be pushed, and the dust suction holes at the top of the dust curtain can rotate by blowing the rotating plate through the flow of air during inhalation; when the air flow flows in from the dust suction holes at the top of the dust curtain, the rotating plate can be blown to rotate continuously, so that when the end of the rotating plate is at the rotating filter, the impurities accumulated on the surface of the filter can be scraped to one side until the impurities are pushed to the suction area away from the dust suction groove, thereby achieving the effect of self-cleaning of the filter and reducing the situation where the filter is blocked due to the accumulation of too many impurities.

[0013] Preferably, when the dust suction hole at the top of the dust curtain is inhaling air, the airflow can blow the rotating plate to rotate counterclockwise, and a partition is connected to the side of the dust curtain away from the dust suction hole, and a discharge port is provided on the side wall of the dust curtain corresponding to the bottom of the partition; by setting the rotation direction of the rotating plate, the rotating plate can push the impurities on the filter screen to the partition away from the dust suction hole when rotating counterclockwise, and can fall downward through the channel between the partition and the dust curtain, thereby reducing the situation where the impurities on the filter screen are affected by the airflow from the dust suction hole at the bottom after falling and are flushed to the filter screen again, thereby improving the impurity collection effect, and when the dust collection work is completed, the discharge port is opened to facilitate the recovery of impurities at the bottom of the partition.

[0014] Preferably, the end of the rotating plate is connected to an elastic flapping plate, and the end of the flapping plate can be squeezed and fitted with the surface of the filter screen when rotating; by arranging a flexible flapping plate at the end of the rotating plate, the scraping range of the end of the rotating plate can be effectively extended, and at the same time, after the flapping plate contacts the filter screen, the filter screen will also shake, thereby promoting the separation of impurities in its mesh opening; at the same time, when the flapping plate pushes the material to the partition, the adjacent flapping plate at the bottom can also seal the top of the partition, thereby reducing the situation where the impurities are re-absorbed by the airflow outside the partition during the process of being pushed down, thereby further improving the impurity collection effect.

[0015] Preferably, an arc plate is connected to the inner wall of the dust curtain corresponding to the bottom end of the dust suction hole, the free end of the arc plate faces upward, and the connecting end of the arc plate is provided with a magnetic block capable of attracting the paddle; the arc plate can guide the airflow sucked into the dust suction hole at its bottom, thereby facilitating the upward transport of dust by the airflow, and at the same time, when the dust collection work is completed, the magnetic block can attract the end of the paddle, so that the paddle can be closed quickly and stably, further reducing the overflow of dust inside the dust curtain.

[0016] Preferably, a cone is connected to a side of the paddle close to the dust suction hole, and when the paddle is closed, it can drive the cone to extend into the dust suction hole; when the dust suction hole is blocked by larger particles, the suction intensity at the dust suction hole is reduced. At this time, the paddle is closed and reset under the action of the magnetic block, and after driving the cone to extend into the dust suction hole, the blocked particles are pushed out and broken, thereby automatically unblocking the dust suction hole.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. A dust reduction device for tunnel opening excavation provided by the present invention places a support plate and a dust suction chamber at the opening. When the suction fan is sucking air, the dust in various areas of the opening can be sucked in through the annular dust suction grooves evenly distributed on the bottom surface of the dust suction chamber, and the dust is introduced into the water tank through the air duct, so that the dust in the air flow is dissolved in water, reducing the pollution to the environment caused by the dust being scattered everywhere during the excavation of the opening. At the same time, the dust can be sucked and collected at multiple points through the dust suction grooves on the dust suction chamber, so that the dust can be collected more comprehensively and fully, reducing the cost of dust collection.

[0019] 2. The present invention provides a tunnel opening excavation dust reduction device. When dust collection is performed, the external airflow can push the paddle away from the dust collection hole and rotate it, so that the dust collection hole is in an open state. When the dust collection work is completed, the paddle closes under its own gravity, thereby blocking the dust collection hole and reducing the overflow of dust sucked in by the dust curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the local structure of the dust curtain in the present invention;

[0025] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0026] Figure 5 is a schematic diagram of the structure of the dust suction hole in the second embodiment;

[0027] In the figure: support seat 1, support plate 2, dust suction chamber 3, dust suction groove 4, water tank 5, air duct 6, suction fan 7, dust curtain 8, dust suction hole 9, paddle 10, filter screen 11, rotating rod 12, rotating plate 13, partition 14, discharge port 15, flapping plate 16, arc plate 17, magnetic block 18, cone 19. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] See also Figure 1-Figure 4As shown, a tunnel opening excavation dust reduction device described in an embodiment of the present invention comprises a support seat 1; an arc-shaped support plate 2 matching the shape of the tunnel opening is arranged on the support seat 1, an arc-shaped dust suction chamber 3 is connected to the outer end of the support plate 2, a group of annular evenly distributed dust suction grooves 4 are arranged on the bottom surface of the dust suction chamber 3, a water tank 5 is arranged on one side of the support seat 1, the water tank 5 is connected to the dust suction chamber 3 through an air duct 6, and a suction fan 7 is arranged on the air duct 6; although the dust at the opening can be sucked in and collected by the suction fan 7 in the prior art, due to the limited suction range of the suction fan 7, in order to achieve a large-area dust suction effect, multiple groups of suction fans 7 need to be arranged, or the dust suction power of the suction fan 7 needs to be increased, thereby increasing the dust reduction cost, and It is easy to have a situation where dust suction dead corners exist, which affects the dust reduction effect when the tunnel entrance is excavated. The present invention places the support plate 2 and the dust suction chamber 3 at the entrance, and can seal the gap between the top surface of the dust suction chamber 3 and the entrance through a sealing material, so as to achieve seamless fitting of the dust suction chamber 3 and the entrance. Subsequently, when the suction fan 7 is exhausting air, it can suck in the dust in various areas of the entrance through the annular dust suction grooves 4 evenly distributed on the bottom surface of the dust suction chamber 3, and introduce it into the water tank 5 through the air guide pipe 6, so that the dust in the air flow is dissolved in water, reducing the pollution to the environment caused by the dust scattered everywhere when the entrance is excavated. At the same time, the dust is sucked and collected at multiple points through the dust suction grooves 4 on the dust suction chamber 3, so that the dust can be collected more comprehensively and fully, reducing the cost of dust collection.

[0031] A group of dust-proof curtains 8 are connected to the bottom surface of the dust suction chamber 3, and the side ends of two adjacent dust-proof curtains 8 fit together, and the dust-proof curtains 8 can block the opening of the dust suction chamber 3; by arranging multiple groups of dust-proof curtains 8 on the dust suction chamber 3, the dust suction chamber 3 can be effectively blocked while ensuring the normal entry and exit of workers, thereby further reducing the overflow of dust inside the hole.

[0032] A cavity is provided inside the dust-proof curtain 8, and the top end of the dust-proof curtain 8 is connected with the air inlet end of the dust suction groove 4. A plurality of dust suction holes 9 are provided on the side wall of the dust-proof curtain 8 near the inner end of the tunnel opening. When the dust suction groove 4 is suctioning air, external gas and dust can be sucked in and collected through the dust suction holes 9 on the dust-proof curtain 8. Since the dust suction holes 9 can be arranged on the dust-proof curtain 8 over a large area, the dust at the opening can be more fully and comprehensively sucked in and recovered, further reducing the situation of dust removal blind spots at the opening.

[0033] A paddle 10 is rotatably connected to the inner wall of the dust curtain 8 corresponding to the inner top of the dust suction hole 9; when dust suction is performed, the external airflow can push the paddle 10 away from the dust suction hole 9 and rotate it, so that the dust suction hole 9 is in an open state. When the dust collection work is completed, the paddle 10 closes under its own gravity, thereby blocking the dust suction hole 9 and reducing the overflow of dust sucked into the dust curtain 8.

[0034] A filter 11 is connected to the end of the dust suction groove 4; when the gas sucked in the dust curtain 8 flows through the dust suction groove 4, some larger impurities can be intercepted by the filter 11, thereby reducing the flow of larger impurities into the suction fan 7, causing the suction fan 7 to get stuck or malfunction.

[0035] The filter 11 is arranged in an arc shape, and a rotating rod 12 is rotatably connected on the inner wall of the dust curtain 8 corresponding to the bottom end of the filter 11, and the axis of the rotating rod 12 coincides with the axis of the filter 11. A group of annular evenly distributed rotating plates 13 are connected to the side walls of the rotating rod 12. When the end of the rotating plate 13 rotates, impurities at the filter 11 can be pushed, and the dust suction hole 9 at the top of the dust curtain 8 can be blown to rotate by the flow of airflow when inhaling; when the airflow flows in from the dust suction hole 9 at the top of the dust curtain 8, it can be blown to rotate the rotating plate 13 continuously, so that when the end of the rotating plate 13 is at the rotating filter 11, the impurities accumulated on the surface of the filter 11 can be scraped to one side until the impurities are pushed to the suction area of ​​the dust suction groove 4, thereby achieving the self-cleaning effect of the filter 11 and reducing the clogging of the filter 11 due to the accumulation of a lot of impurities.

[0036] When the dust suction hole 9 at the top of the dust curtain 8 inhales air, the airflow can blow the rotating plate 13 to rotate counterclockwise, and the side of the dust curtain 8 away from the dust suction hole 9 is connected with a partition 14, and the side wall of the dust curtain 8 corresponding to the bottom of the partition 14 is provided with a discharge port 15; by setting the rotation direction of the rotating plate 13, the rotating plate 13 can push the impurities on the filter screen 11 to the partition 14 away from the dust suction hole 9 when rotating counterclockwise, and can fall downward through the channel between the partition 14 and the dust curtain 8, thereby reducing the situation where the impurities on the filter screen 11 are affected by the airflow of the bottom dust suction hole 9 after falling and are flushed to the filter screen 11 again, thereby improving the collection effect of impurities. When the dust collection work is completed, the discharge port 15 is opened to facilitate the recovery of impurities at the bottom of the partition 14.

[0037] The end of the rotating plate 13 is connected to an elastic slapping plate 16, and the end of the slapping plate 16 can be squeezed and fitted with the surface of the filter screen 11 when rotating; by arranging a flexible slapping plate 16 at the end of the rotating plate 13, the scraping range of the end of the rotating plate 13 can be effectively extended, and at the same time, after the slapping plate 16 contacts the filter screen 11, the filter screen 11 will also shake, thereby promoting the separation of impurities in its mesh opening. At the same time, when the slapping plate 16 pushes the material to the partition 14, the slapping plate 16 adjacent to the bottom can also block the top of the partition 14, thereby reducing the situation where the impurities are re-absorbed by the airflow outside the partition 14 during the process of being pushed down, thereby further improving the impurity collection effect.

[0038] Embodiment 2:

[0039] like Figure 5 As shown, compared with Example 1, another implementation of the present invention is: an arc plate 17 is connected to the inner wall of the dust curtain 8 corresponding to the bottom end of the dust suction hole 9, the free end of the arc plate 17 faces upward, and the connecting end of the arc plate 17 is provided with a magnetic block 18 capable of attracting the paddle 10; the arc plate 17 is able to guide the airflow sucked into the dust suction hole 9 at its bottom, so as to facilitate the upward transportation of dust by the airflow, and at the same time, when the dust collection work is completed, the magnetic block 18 can attract the end of the paddle 10, so that the paddle 10 can be quickly and stably closed, further reducing the overflow of dust inside the dust curtain 8.

[0040] A cone 19 is connected to one side of the paddle 10 close to the dust suction hole 9. When the paddle 10 is closed, it can drive the cone 19 to extend into the dust suction hole 9. When the dust suction hole 9 is blocked by larger particles, the suction intensity at the dust suction hole 9 is reduced. At this time, the paddle 10 is closed and reset under the action of the magnetic block 18, and drives the cone 19 to extend into the dust suction hole 9, pushes out the blocked particles, and breaks them, so that the dust suction hole 9 can be automatically unblocked.

[0041] Working principle: By placing the support plate 2 and the dust suction chamber 3 at the hole opening, the present invention can seal the gap between the top surface of the dust suction chamber 3 and the hole opening through a sealing material, so as to achieve seamless fitting between the dust suction chamber 3 and the hole opening. Subsequently, when the suction fan 7 is exhausting air, the dust at various areas of the hole opening can be sucked in through the annular dust suction grooves 4 evenly distributed on the bottom surface of the dust suction chamber 3, and introduced into the water tank 5 through the air guide pipe 6, so that the dust in the air flow is dissolved in the water, reducing the pollution to the environment caused by the dust being scattered everywhere when the hole opening is excavated. At the same time, the dust can be sucked and collected at multiple points through the dust suction grooves 4 on the dust suction chamber 3, so that the dust can be collected more comprehensively and fully, reducing The cost of dust collection is reduced; by arranging multiple groups of dust-proof curtains 8 on the dust suction chamber 3, the dust suction chamber 3 can be effectively blocked while ensuring the normal entry and exit of workers, thereby further reducing the dust overflow from the hole opening; when the dust suction groove 4 is sucking air, the external gas and dust can be sucked in and collected through the dust suction holes 9 on the dust-proof curtains 8. Since the dust suction holes 9 can be arranged on the dust-proof curtains 8 over a large area, the dust at the hole opening can be more fully and comprehensively sucked in and recovered, further reducing the situation of dust removal dead corners at the hole opening; when the dust suction process is being carried out, the external airflow can push the paddle 10 away from the dust suction hole 9 and make it rotate, so that the dust suction hole 9 is in a In the open state, when the dust collection work is finished, the paddle 10 closes under its own gravity, thereby blocking the dust suction hole 9 and reducing the dust sucked in the dust curtain 8 from overflowing; when the gas sucked in the dust curtain 8 flows through the dust suction groove 4, some larger impurities can be intercepted by the filter screen 11, thereby reducing the situation where larger impurities flow into the suction fan 7 and cause the suction fan 7 to get stuck or malfunction; when the air flow flows in from the dust suction hole 9 at the top of the dust curtain 8, the rotating plate 13 can be blown to rotate continuously, so that when the end of the rotating plate 13 is at the rotating filter screen 11, the impurities accumulated on the surface of the filter screen 11 can be scraped to one side until the impurities are pushed out of the suction The suction area of ​​the dust trough 4 is formed so as to achieve the effect of self-cleaning of the filter 11 and reduce the situation that the filter 11 is blocked due to the accumulation of a lot of impurities; by setting the rotation direction of the rotating plate 13, the rotating plate 13 can push the impurities on the filter 11 to the partition 14 on the side away from the dust suction hole 9 when rotating counterclockwise, and can fall downward through the channel between the partition 14 and the dust curtain 8, reducing the situation that the impurities on the filter 11 are affected by the airflow of the bottom dust suction hole 9 after falling and are flushed to the filter 11 again, thereby improving the collection effect of impurities. When the dust collection work is completed, the discharge port 15 is opened, so as to facilitate the recovery of impurities at the bottom of the partition 14;By providing a flexible flapping plate 16 at the end of the rotating plate 13, the scraping range of the end of the rotating plate 13 can be effectively extended. At the same time, after the flapping plate 16 contacts the filter screen 11, the filter screen 11 will also shake, thereby promoting the separation of impurities in its mesh opening. At the same time, when the flapping plate 16 pushes the material to the partition 14, the flapping plate 16 adjacent to the bottom can also block the top of the partition 14, thereby reducing the situation where the impurities are re-absorbed by the airflow outside the partition 14 during the process of being pushed down, thereby further improving the collection effect of impurities; the arc plate 17 provided can suck the dust into the dust suction hole 9 at its bottom The airflow guides the dust upwards, and when the dust collection is finished, the magnetic block 18 can attract the end of the paddle 10, so that the paddle 10 closes quickly and stably, further reducing the dust overflow from the dust curtain 8; when the dust suction hole 9 is blocked by larger particles, the suction strength at the dust suction hole 9 is reduced. At this time, the paddle 10 closes and resets under the action of the magnetic block 18, and drives the cone 19 to extend into the dust suction hole 9, pushes out the blocked particles, and breaks them, so that the dust suction hole 9 can be automatically unblocked. ;

[0042] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tunnel opening excavation dust reduction device, comprising a support base (1); characterized in that: The support seat (1) is provided with an arc-shaped support plate (2) matching the shape of the tunnel opening, the outer end of the support plate (2) is connected to an arc-shaped dust suction chamber (3), a group of annular dust suction grooves (4) are arranged on the bottom surface of the dust suction chamber (3), a water tank (5) is arranged on one side of the support seat (1), the water tank (5) and the dust suction chamber (3) are connected via an air guide pipe (6), and a suction fan (7) is arranged on the air guide pipe (6); A group of dustproof curtains (8) are connected to the bottom surface of the dust suction chamber (3), the side ends of two adjacent dustproof curtains (8) are in contact with each other, and the dustproof curtains (8) are capable of blocking the opening of the dust suction chamber (3); A cavity is provided inside the dust curtain (8), the top end of the dust curtain (8) is connected to the air inlet end of the dust suction groove (4), and a plurality of groups of dust suction holes (9) are provided on the side wall of the dust curtain (8) near the inner end of the tunnel opening; a filter screen (11) is connected to the end of the dust suction groove (4); The filter (11) is arranged in an arc shape, and a rotating rod (12) is rotatably connected to the inner wall of the dust curtain (8) corresponding to the bottom end of the filter (11), and the axis of the rotating rod (12) coincides with the axis of the filter (11). A group of annularly evenly distributed rotating plates (13) are connected to the side wall of the rotating rod (12), and when the end of the rotating plate (13) rotates, the impurities on the filter (11) can be pushed, and when the dust suction hole (9) at the top end of the dust curtain (8) is inhaled, the rotating plate (13) can be rotated by the flow of airflow; When the dust suction hole (9) at the top of the dust-proof curtain (8) sucks air, the airflow can blow the rotating plate (13) to rotate counterclockwise, and a partition plate (14) is connected to the side of the dust-proof curtain (8) away from the dust suction hole (9), and a discharge port (15) is provided on the side wall of the dust-proof curtain (8) corresponding to the bottom end of the partition plate (14); The end of the rotating plate (13) is connected to an elastic flapping plate (16), and the end of the flapping plate (16) can be pressed and fitted with the surface of the filter screen (11) when rotating.

2. A tunnel opening excavation dust suppression device according to claim 1, characterized in that: A paddle (10) is rotatably connected to the inner wall of the dustproof curtain (8) corresponding to the inner top end of the dust suction hole (9).

3. A tunnel opening excavation dust suppression device according to claim 2, characterized in that: An arc-shaped plate (17) is connected to the inner wall of the dust-proof curtain (8) corresponding to the bottom end of the dust suction hole (9), the free end of the arc-shaped plate (17) faces upward, and a magnetic block (18) capable of attracting the paddle (10) is provided at the connection end of the arc-shaped plate (17).

4. A tunnel opening excavation dust suppression device according to claim 3, characterized in that: A side of the paddle (10) close to the dust suction hole (9) is connected to a cone (19); when the paddle (10) is closed, the cone (19) can be driven to extend into the dust suction hole (9).

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